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  1. Calcite
  2. CALCITE-4138

Metadata operations via Avatica turn empty string args to null

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      DatabaseMetaData.getTables(), and some other functions have parameters (catalog, schemaPattern), where null and empty String have different semantics.

      The corresponding protobuf fields in Avatica are Strings, and the Avatica logic turns those args to null.

      This makes it impossible to filter on actual empty string values.

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            stoty Istvan Toth
            stoty Istvan Toth
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